WO2012033179A1 - 照明装置、投射装置および投射型映像表示装置 - Google Patents

照明装置、投射装置および投射型映像表示装置 Download PDF

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Publication number
WO2012033179A1
WO2012033179A1 PCT/JP2011/070529 JP2011070529W WO2012033179A1 WO 2012033179 A1 WO2012033179 A1 WO 2012033179A1 JP 2011070529 W JP2011070529 W JP 2011070529W WO 2012033179 A1 WO2012033179 A1 WO 2012033179A1
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Prior art keywords
light
coherent light
coherent
recording medium
hologram recording
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PCT/JP2011/070529
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English (en)
French (fr)
Japanese (ja)
Inventor
知枝 高野倉
一敏 石田
牧夫 倉重
大八木　康之
Original Assignee
大日本印刷株式会社
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Application filed by 大日本印刷株式会社 filed Critical 大日本印刷株式会社
Priority to EP11823653.8A priority Critical patent/EP2615496B1/de
Priority to EP18214351.1A priority patent/EP3486696B1/de
Priority to US13/821,754 priority patent/US9039188B2/en
Priority to JP2012533031A priority patent/JP5737633B2/ja
Publication of WO2012033179A1 publication Critical patent/WO2012033179A1/ja

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/3111—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/0944—Diffractive optical elements, e.g. gratings, holograms
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems
    • G02B26/105—Scanning systems with one or more pivoting mirrors or galvano-mirrors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/48—Laser speckle optics
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1842—Gratings for image generation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/32—Holograms used as optical elements
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2066—Reflectors in illumination beam
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/208—Homogenising, shaping of the illumination light
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/28—Reflectors in projection beam
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B33/00—Colour photography, other than mere exposure or projection of a colour film
    • G03B33/06—Colour photography, other than mere exposure or projection of a colour film by additive-colour projection apparatus
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B33/00—Colour photography, other than mere exposure or projection of a colour film
    • G03B33/10—Simultaneous recording or projection
    • G03B33/12—Simultaneous recording or projection using beam-splitting or beam-combining systems, e.g. dichroic mirrors
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/32—Systems for obtaining speckle elimination
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/89—Television signal recording using holographic recording
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3161—Modulator illumination systems using laser light sources
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2286—Particular reconstruction light ; Beam properties
    • G03H2001/2292—Using scanning means

Definitions

  • the present invention has been made in consideration of the above points, and is an illuminating apparatus that illuminates an illuminated area with a plurality of coherent lights having different wavelength ranges, and can make speckles inconspicuous It is another object of the present invention to provide a projection apparatus and a projection-type image display apparatus including the illumination apparatus.
  • a second lighting device comprises: An optical element including a hologram recording medium capable of diffracting a first coherent light in a first wavelength region and a second coherent light in a second wavelength region different from the first wavelength region; An irradiation device that irradiates the optical element with a plurality of coherent lights having different wavelength ranges so that the first coherent light and the second coherent light scan on the hologram recording medium, The first coherent light incident on each position of the hologram recording medium from the irradiation device illuminates a region that is diffracted by the hologram recording medium and overlaps at least in part, and from the irradiation device to the hologram recording The illumination device and the optical element are arranged so that the second coherent light incident on each position of the medium illuminates a region that is diffracted by the hologram recording medium and at least partially overlaps each other. apparatus.
  • a fourth lighting device includes: An optical element including a light diffusing element that changes a traveling direction of incident light; The plurality of coherent lights having different wavelength ranges are scanned by the optical coherent light so that the first coherent light in the first wavelength range and the second coherent light in the second wavelength range different from the first wavelength range scan on the light diffusion element.
  • An irradiation device for irradiating the element The first coherent light incident on each position of the light diffusing element from the irradiation device illuminates a region where the traveling direction is changed by the light diffusing element and overlaps at least in part, and the light is emitted from the irradiation device.
  • the irradiation device and the optical element are arranged so that the second coherent light incident on each position of the diffusing element illuminates a region where the traveling direction is changed by the light diffusing element and overlaps at least partially. ing.
  • the light diffusing element may be a lens array.
  • the plurality of coherent lights having different wavelength ranges may be irradiated from the irradiation device to the optical element in the same optical path.
  • the irradiating device includes a light source mechanism that generates a synthesized light obtained by synthesizing a plurality of coherent lights having different wavelength ranges, and the light source mechanism from the light source mechanism. And a scanning device that changes the traveling direction of the combined light so that the combined light scans the optical element.
  • the light source mechanism combines a plurality of light sources that respectively generate coherent light in each wavelength region and the coherent light from the plurality of light sources. And a synthesizing device.
  • the projection apparatus Any one of the first to fourth lighting devices according to the present invention described above; A spatial light modulator disposed at a position overlapping the area to be illuminated by the illumination device and illuminated by the illumination device.
  • a first projection display apparatus is: Any of the projection devices according to the invention described above; And a screen on which a modulated image obtained on the spatial light modulator is projected.
  • FIG. 7 is a diagram for explaining another modification of the optical element, and is a plan view showing the optical element together with a corresponding illuminated region.
  • FIG. 8 is a diagram corresponding to FIG. 5, and is a perspective view for explaining a modified example of the irradiation apparatus and its operation.
  • FIG. 9 is a view corresponding to FIG. 2, and is a perspective view for explaining another modification of the irradiation apparatus and its operation.
  • FIG. 10 is a diagram for explaining an application form to which the basic form of one embodiment according to the present invention is applied, and is a lighting device, a projection apparatus, and a projection type video display apparatus as specific examples of the application form. It is a figure which shows schematic structure of these.
  • the illumination device, projection device, and projection-type image display device have a configuration that enables effective prevention of speckle as a basic configuration. Furthermore, the illumination device, the projection device, and the projection-type image display device according to an embodiment of the present invention have a configuration in which a basic configuration that can effectively prevent speckle is applied, and the wavelength ranges are mutually different. It also includes a configuration that enables handling of a plurality of different coherent lights.
  • a configuration for making speckles inconspicuous can be achieved based on the configuration.
  • the operational effects and the modification of the configuration will be described as basic forms.
  • the configuration applying the basic form the configuration that enables the handling of a plurality of coherent lights having different wavelength ranges, the operational effects that can be achieved based on the configuration, and the modification of the configuration, This will be described as an applied form.
  • the spatial light modulator 30 for example, a transmissive liquid crystal microdisplay can be used.
  • the spatial light modulator 30 illuminated in a planar shape by the illumination device 40 selects and transmits coherent light for each pixel, thereby forming a modulated image on the screen of the display that forms the spatial light modulator 30. Will come to be.
  • the modulated image (video light) thus obtained is projected onto the screen 15 at the same magnification or scaled by the projection optical system 25.
  • the modulated image is displayed on the screen 15 at the same magnification or scaled (usually enlarged), and the observer can observe the image.
  • a reflection type micro display can be used as the spatial light modulator 30, a reflection type micro display.
  • a modulated image is formed by the reflected light from the spatial light modulator 30, the surface on which the spatial light modulator 30 is irradiated with coherent light from the illumination device 40, and the image light that forms the modulated image from the spatial light modulator 30.
  • the surface where the lead is the same surface.
  • a MEMS element such as DMD (Digital Micromirror Device) as the spatial light modulator 30.
  • DMD Digital Micromirror Device
  • the incident surface of the spatial light modulator 30 has the same shape and size as the illuminated region LZ irradiated with the coherent light by the illumination device 40. In this case, it is because the coherent light from the illuminating device 40 can be used with high utilization efficiency for displaying the image on the screen 15.
  • the screen 15 may be configured as a transmissive screen or may be configured as a reflective screen.
  • the screen 15 is configured as a reflective screen, the observer observes an image displayed by coherent light reflected by the screen 15 from the same side as the projection device 20 with respect to the screen 15.
  • the screen 15 is configured as a transmissive screen, the observer observes an image displayed by coherent light transmitted through the screen 15 from the side opposite to the projection device 20 with respect to the screen 15. .
  • the coherent light projected on the screen 15 is diffused and recognized as an image by the observer.
  • the coherent light projected on the screen interferes by diffusion and causes speckle.
  • the illumination apparatus 40 described below illuminates the illuminated area LZ on which the spatial light modulator 30 is superimposed with coherent light that changes in angle with time. It is like that. More specifically, the illuminating device 40 described below illuminates the illuminated region LZ with diffused light composed of coherent light, and the incident angle of this diffused light changes over time.
  • the diffusion pattern of the coherent light on the screen 15 also changes with time, and speckles generated by the diffusion of the coherent light are temporally superimposed and become inconspicuous.
  • such an illuminating device 40 will be described in more detail.
  • the illumination device 40 shown in FIGS. 1 and 2 includes an optical element 50 that directs the traveling direction of the coherent light toward the illuminated region LZ, and an irradiation device 60 that irradiates the optical element 50 with the coherent light.
  • the optical element 50 includes a hologram recording medium 55 that functions as a light diffusing element or a light diffusing element, in particular, a hologram recording medium 55 that can reproduce the image 5 of the scattering plate 6.
  • the optical element 50 is formed from a hologram recording medium 55.
  • the coherent light incident on each position of the hologram recording medium 55 from the irradiation device 60 is superimposed on the illuminated region LZ to reproduce the image 5 of the scattering plate 6. It has become. That is, the coherent light that has entered the hologram recording medium 55 from the irradiation device 60 is diffused (expanded) by the optical element 50 and enters the illuminated area LZ.
  • a reflective volume hologram using a photopolymer is used as the hologram recording medium 55 that enables the diffraction action of such coherent light.
  • the hologram recording medium 55 is manufactured by using the scattered light from the actual scattering plate 6 as the object light Lo.
  • FIG. 3 shows a state in which the hologram photosensitive material 58 having photosensitivity that forms the hologram recording medium 55 is exposed to the reference light Lr and the object light Lo, which are coherent light beams having coherence with each other. ,It is shown.
  • a parallel light beam parallel to the normal direction to the plate surface of the scattering plate 6 is incident on and scattered by the scattering plate 6, and the scattered light transmitted through the scattering plate 6 is the object light Lo.
  • the light enters the hologram photosensitive material 58.
  • the object light Lo from the scattering plate 6 is incident on the hologram photosensitive material 58 with a substantially uniform light amount distribution. Is possible.
  • the hologram recording material 58 when the hologram recording material 58 is exposed to the reference light Lr and the object light Lo, an interference fringe formed by the interference of the reference light Lr and the object light Lo is generated. It is recorded on the hologram recording material 58 as a pattern (in the case of a volume hologram, for example, a refractive index modulation pattern). Thereafter, appropriate post-processing corresponding to the type of the hologram recording material 58 is performed, and the hologram recording material 55 is obtained.
  • a pattern in the case of a volume hologram, for example, a refractive index modulation pattern
  • FIG. 4 shows the diffraction action (reproduction action) of the hologram recording medium 55 obtained through the exposure process of FIG.
  • the hologram recording medium 55 formed from the hologram photosensitive material 58 of FIG. 3 is light having the same wavelength as the laser beam used in the exposure process, and the optical path of the reference light Lr in the exposure process. The light traveling in the opposite direction satisfies the Bragg condition. That is, as shown in FIG. 4, the reference point SP positioned with respect to the hologram recording medium 55 in the same positional relationship as the relative position of the focal point FP (see FIG. 3) with respect to the hologram photosensitive material 58 during the exposure process.
  • the object light Lo from the entire area of the exit surface 6 a of the scattering plate 6 is incident on each position on the hologram photosensitive material 58, and as a result, information on the entire exit surface 6 a is placed on each position of the hologram recording medium 55. Each is recorded. For this reason, each light which forms the divergent light beam from the reference point SP functioning as the reproduction illumination light La shown in FIG. 4 is incident on each position of the hologram recording medium 55 independently and has the same contour.
  • the image 5 of the scattering plate 6 can be reproduced at the same position (illuminated area LZ).
  • FIG. 5 shows the configuration of the illumination device 40 shown in FIG. 2 as a perspective view.
  • the rotation axis RA ⁇ b> 1 of the mirror 66 a has an XY coordinate system defined on the plate surface of the hologram recording medium 55 (that is, the XY plane is parallel to the plate surface of the hologram recording medium 55. It extends parallel to the Y axis of the (XY coordinate system).
  • the coherent light from the irradiation device 60 is applied to the optical element 50.
  • the incident point IP reciprocates in a direction parallel to the X axis of the XY coordinate system defined on the plate surface of the hologram recording medium 55. That is, in the example shown in FIG. 5, the irradiation device 60 irradiates the optical element 50 with coherent light so that the coherent light scans on the hologram recording medium 55 along a linear path.
  • the traveling direction of the light incident on the hologram recording medium 55 of the optical element 50 does not take exactly the same path as the one light beam included in the divergent light beam from the reference point SP, it is illuminated.
  • the image 5 can be reproduced in the region LZ.
  • the mirror (reflecting surface) 66a of the mirror device 66 constituting the scanning device 65 is inevitably deviated from the rotation axis RA1. Therefore, when the mirror 66a is rotated around the rotation axis RA1 that does not pass through the reference point SP, the light incident on the hologram recording medium 55 may not be a single light beam that forms a divergent light beam from the reference point SP. is there.
  • the image 5 can be substantially reproduced by being superimposed on the illuminated region LZ by coherent light from the irradiation device 60 having the illustrated configuration.
  • the irradiation device 60 irradiates the optical element 50 with the coherent light so that the coherent light scans the hologram recording medium 55 of the optical element 50.
  • coherent light having a specific wavelength traveling along a certain direction is generated by the laser light source 61 a, and the traveling direction of the coherent light is changed by the scanning device 65.
  • the scanning device 65 causes coherent light having a specific wavelength to enter each position on the hologram recording medium 55 at an incident angle that satisfies the Bragg condition at the position.
  • the coherent light incident at each position is superimposed on the illuminated region LZ by the diffraction at the hologram recording medium 55 to reproduce the image 5 of the scattering plate 6.
  • the coherent light that has entered the hologram recording medium 55 from the irradiation device 60 is diffused (expanded) by the optical element 50 and enters the entire illuminated area LZ. In this way, the irradiation device 60 illuminates the illuminated area LZ with coherent light.
  • speckle can be made inconspicuous by multiplying parameters such as polarization, phase, angle and time and increasing modes It is said that it is effective.
  • the mode here refers to speckle patterns that are uncorrelated with each other. For example, when coherent light is projected from different directions onto the same screen from a plurality of laser light sources, there are as many modes as the number of laser light sources. In addition, when coherent light from the same laser light source is projected onto the screen from different directions by dividing the time, the mode is the same as the number of times the incident direction of the coherent light has changed during the time that cannot be resolved by the human eye. Will exist. When there are a large number of these modes, the interference patterns of light are uncorrelated and averaged, and as a result, speckles observed by the observer's eyes are considered inconspicuous.
  • the coherent light is irradiated onto the optical element 50 so as to scan the hologram recording medium 55.
  • the coherent light incident on each position of the hologram recording medium 55 from the irradiation device 60 illuminates the entire illuminated area LZ with the coherent light, but the illumination of the coherent light that illuminates the illuminated area LZ.
  • the directions are different from each other. Since the position on the hologram recording medium 55 where the coherent light enters changes with time, the incident direction of the coherent light to the illuminated region LZ also changes with time.
  • the incident direction of the coherent light changes temporally at each position on the screen 15 displaying an image, and this change is caused by human eyes.
  • a non-correlated coherent light scattering pattern is multiplexed and observed by the human eye. Therefore, speckles generated corresponding to each scattering pattern are overlapped and averaged and observed by an observer. Thereby, speckles can be made very inconspicuous for an observer who observes the image displayed on the screen 15.
  • speckles observed by humans include not only speckles on the screen caused by scattering of coherent light on the screen 15, but also scattering of coherent light before being projected on the screen. Speckle on the projection device side can also occur.
  • the speckle pattern generated on the projection device side is projected onto the screen 15 via the spatial light modulator 30 so that it can be recognized by the observer.
  • the coherent light continuously scans on the hologram recording medium 55, and the coherent light incident on each position of the hologram recording medium 55 is superimposed on the spatial light modulator 30, respectively. The entire illuminated area LZ is illuminated.
  • the hologram recording medium 55 forms a new wavefront that is separate from the wavefront used to form the speckle pattern, and the illumination area LZ and further the spatial light modulator 30 are formed in a complex and uniform manner. Through this, the screen 15 is illuminated. Due to the formation of a new wavefront on the hologram recording medium 55, the speckle pattern generated on the projection apparatus side is made invisible.
  • the speckle contrast of the basic projection type image display apparatus 10 described with reference to FIGS. 1 to 5 was 3.0% (Condition 1). Further, as the above-described optical element 50, an uneven shape designed by using a computer so that the image 5 of the scattering plate 6 can be reproduced when receiving specific reproduction illumination light instead of the reflective volume hologram.
  • the speckle contrast in the case of using the relief type hologram as a computer-generated hologram (CGH) having a ratio of 3.7% was (Condition 2).
  • a speckle contrast of 6.0% or less is a standard (for example, WO / 2001/081996) as a level at which an uneven brightness pattern is hardly recognized when an observer observes with the naked eye.
  • the basic form described above sufficiently satisfies this standard.
  • brightness unevenness (brightness unevenness) that could be visually recognized did not occur.
  • condition 1 and condition 2 were much better than the results of condition 3, and even better compared to the measurement results of condition 4.
  • the problem of speckle generation is a problem inherent in the case of using a coherent light source such as a laser beam in practice, and it is necessary to consider in an apparatus using a non-coherent light source such as an LED. There is no problem.
  • condition 1 and condition 2 as compared with condition 4, an optical element 50 that can cause speckles is added. From these points, it can be said that Condition 1 and Condition 2 were sufficient to cope with speckle defects.
  • the optical element 50 for making speckles inconspicuous can also function as an optical member for shaping and adjusting the beam form of coherent light emitted from the irradiation device 60. Therefore, the optical system can be reduced in size and simplified.
  • coherent light incident on each position of the hologram recording medium 55 generates an image 5 of the scattering plate 6 at the same position, and is superimposed on the image 5 to generate spatial light.
  • a modulator 30 is arranged. Therefore, the light diffracted by the hologram recording medium 55 can be used for image formation with high efficiency, and the use efficiency of light from the light source 61a is excellent.
  • the lighting device 40 can be usefully used in various aspects.
  • the illumination device 40 can be used as simple illumination, and in this case, unevenness in brightness (luminance unevenness, flicker) can be made inconspicuous.
  • the illumination device 40 described above may be used as illumination for a scanner (for example, an image reading device).
  • the speckle generated on the target object can be made inconspicuous by arranging the target object to be scanned on the illuminated region LZ of the lighting device 40. As a result, it is possible to eliminate image correction means and the like that are conventionally required.
  • the illuminated area LZ by the illuminating device 40 may be a surface in the same manner as described above.
  • the illuminated region LZ by the illumination device 40 may be an elongated region (region also called a linear shape) extending in one direction.
  • two-dimensional image information can be read by the illuminating device 40 incorporated in the scanner moving relative to the object along a direction orthogonal to the one direction.
  • the optical element 50 may include a plurality of hologram recording media 55-1, 55-2,... Arranged side by side so as not to overlap.
  • Each of the hologram recording media 55-1, 55-2,... Shown in FIG. 6 is formed in a strip shape, and is arranged side by side with no gap in a direction orthogonal to the longitudinal direction.
  • the hologram recording media 55-1, 55-2,... Are located on the same virtual plane.
  • Each hologram recording medium 55-1, 55-2,... Has an image 5 of the scattering plate 6 on the illuminated areas LZ-1, LZ-2,. Generate, in other words, illuminate the illuminated areas LZ-1, LZ-2,... With coherent light.
  • Each of the illuminated areas LZ-1, LZ-2,... Is formed as an elongated area extending in one direction (an area that is also called a linear shape), and arranged side by side in the direction perpendicular to the longitudinal direction without any gap. Further, the illuminated areas LZ-1, LZ-2,... Are located on the same virtual plane.
  • speckle can be effectively made inconspicuous.
  • this effect is mainly due to the lighting device 40.
  • this lighting device 40 is combined with various known spatial light modulators, projection optical systems, screens, etc., speckles can be effectively made inconspicuous.
  • the spatial light modulator, the projection optical system, and the screen are not limited to those illustrated, and various known members, components, devices, and the like can be used.
  • the hologram recording medium 55 is manufactured by the interference exposure method using the planar scattering plate 6 having a shape corresponding to the incident surface of the spatial light modulator 30 .
  • the hologram recording medium 55 may be manufactured by an interference exposure method using a scattering plate having a certain pattern. In this case, the image of the scattering plate having a certain pattern is reproduced by the hologram recording medium 55. In other words, the optical element 50 (hologram recording medium 55) illuminates the illuminated area LZ having a certain pattern.
  • the spatial light modulator 30 and the projection optical system 25 are also omitted from the basic form described above, and the screen 15 is disposed on the screen 15 by overlapping with the illuminated region LZ. Any pattern recorded on the hologram recording medium 55 can be displayed. Also in this display device, the speckles on the screen 15 can be made inconspicuous by the irradiation device 60 irradiating the optical element 50 with the coherent light so that the coherent light scans the hologram recording medium 55. .
  • FIG. 7 discloses an example of such an example.
  • the optical element 50 includes first to third hologram recording media 55-1, 55-2, and 55-3.
  • the first to third hologram recording media 55-1, 55-2, and 55-3 are arranged on surfaces parallel to the incident surface of the optical element 50 so as not to overlap each other.
  • Each of the hologram recording media 55-1, 55-2, 55-3 can reproduce the image 5 having the outline of the arrow, in other words, the illuminated areas LZ-1, LZ- having the outline of the arrow. 2 and LZ-3 can be illuminated with coherent light.
  • the first to third illuminated areas LZ-1, LZ-2, and LZ-3 corresponding to the hologram recording media 55-1, 55-2, and 55-3 overlap each other on the same virtual plane.
  • the directions indicated by the arrows forming the illuminated areas LZ-1, LZ-2, and LZ-3 are all the same, and the first to third illuminated areas LZ-1, LZ-2 and LZ-3 are positioned in order.
  • the coherent light from the irradiation device 60 is scanning the first hologram recording medium 55-1, the first illuminated area LZ-1 located at the rearmost position is illuminated.
  • the coherent light from the irradiation device 60 scans on the second hologram recording medium 55-2, and the second illuminated region LZ-2 located in the middle is formed. Illuminated. Thereafter, when the coherent light from the irradiation device 60 scans the third hologram recording medium 55-3, the foremost third illuminated region LZ-3 is illuminated.
  • the scanning device 65 is an example of the uniaxial rotation type mirror device 66 that changes the traveling direction of the coherent light by reflection, the scanning device 65 is not limited thereto. As shown in FIG. 8, the scanning device 65 has a second rotation in which the mirror (reflection surface 66a) of the mirror device 66 intersects not only the first rotation axis RA1 but also the first rotation axis RA1. It may be rotatable about the axis RA2. In the example shown in FIG.
  • the second rotation axis RA2 of the mirror 66a is a first rotation axis RA1 extending in parallel with the Y axis of the XY coordinate system defined on the plate surface of the hologram recording medium 55.
  • the incident point IP of the coherent light from the irradiation device 60 to the optical element 50 is the plate of the hologram recording medium 55. It is possible to move in a two-dimensional direction on the surface. For this reason, as shown in FIG. 8 as an example, the incident point IP of the coherent light to the optical element 50 can be moved on the circumference.
  • the scanning device 65 may include two or more mirror devices 66.
  • the mirror 66a of the mirror device 66 can be rotated only about a single axis, the incident point IP of the coherent light from the irradiation device 60 to the optical element 50 is expressed by the hologram recording medium 55. It can be moved in a two-dimensional direction on the plate surface.
  • mirror device 66a included in the scanning device 65 includes a MEMS mirror, a polygon mirror, and the like.
  • the scanning device 65 may include a device other than the reflection device (for example, the mirror device 66 described above) that changes the traveling direction of the coherent light by reflection.
  • the scanning device 65 may include a refractive prism, a lens, and the like.
  • the scanning device 65 is not essential, and the light source 61a of the irradiation device 60 is configured to be displaceable (moving, swinging, rotating) with respect to the optical element 50, and from the light source 61a by the displacement of the light source 61a with respect to the optical element.
  • the irradiated coherent light may be scanned on the hologram recording medium 55.
  • the present invention is not limited to this.
  • the coherent light irradiated to each position of the optical element 50 is shaped by the optical element 50 into a light beam that enters the entire illuminated area LZ. Therefore, there is no inconvenience even if the coherent light irradiated to the optical element 50 from the light source 61a of the irradiation device 60 is not accurately shaped. For this reason, the coherent light generated from the light source 61a may be diverging light. Further, the cross-sectional shape of the coherent light generated from the light source 61a may be an ellipse or the like instead of a circle. Furthermore, the transverse mode of the coherent light generated from the light source 61a may be a multimode.
  • the coherent light is incident on a region having a certain area instead of a point when entering the hologram recording medium 55 of the optical element 50.
  • the light diffracted by the hologram recording medium 55 and incident on each position of the illuminated area LZ is multiplexed in angle.
  • coherent light is incident on each position of the illuminated area LZ from a certain angle range. Speckle can be made more inconspicuous by such multiplexing of angles.
  • the scanning device 65 may further include a condensing lens 67 disposed on the downstream side of the mirror device 66 along the optical path of the coherent light.
  • the light from the mirror device 66 that travels the optical path of the light beam constituting the divergent light beam becomes light that travels in a certain direction by the condenser lens 67.
  • the irradiation device 60 causes the coherent light to be incident on the optical element 50 so as to follow the optical path of the light beam constituting the parallel light flux.
  • a parallel light beam is used as the reference light Lr instead of the above-described convergent light beam in the exposure process when the hologram recording medium 55 is manufactured.
  • Such a hologram recording medium 55 can be produced and duplicated more easily.
  • the irradiation device 60 may include a plurality of light sources that oscillate light in the same wavelength region.
  • the illumination device 40 can illuminate the illuminated area LZ more brightly.
  • coherent lights from different solid laser light sources do not have coherence with each other. Therefore, the multiplexing of the scattering pattern further proceeds and the speckle can be made less noticeable.
  • the optical element 50 may include a plurality of hologram recording media 55. Further, the optical element 50 may include a volume hologram that is recorded using a photosensitive medium including a silver salt material. Further, the optical element 50 may include a transmission type volume hologram recording medium or a relief type (emboss type) hologram recording medium.
  • a relief (embossed) hologram is recorded with hologram interference fringes due to the uneven structure on the surface.
  • scattering due to the uneven structure on the surface may become a new speckle generation factor.
  • the volume type hologram is preferable.
  • the hologram interference fringe is recorded as a refractive index modulation pattern (refractive index distribution) inside the medium, it is not affected by scattering due to the uneven structure on the surface.
  • the hologram recording medium 55 is preferably a volume hologram using a photopolymer.
  • a so-called Fresnel type hologram recording medium is produced.
  • a Fourier transform type hologram recording medium obtained by performing recording using a lens may be produced. Absent.
  • a lens may also be used during image reproduction.
  • the striped pattern (refractive index modulation pattern or concave / convex pattern) to be formed on the hologram recording medium 55 does not use the actual object light Lo and reference light Lr, but the planned wavelength and incident direction of the reproduction illumination light La. In addition, it may be designed using a computer based on the shape and position of the image to be reproduced.
  • the hologram recording medium 55 obtained in this way is also called a computer-generated hologram.
  • the hologram recording medium 55 as a computer-generated hologram corresponds to the coherent light in each wavelength range.
  • the coherent light in each wavelength region may be diffracted in the corresponding region to reproduce an image.
  • the optical element 50 expands the coherent light irradiated to each position, and uses the expanded coherent light as a light diffusing element or light diffusing element that illuminates the entire illuminated area LZ.
  • the optical element 50 changes or diffuses the traveling direction of the coherent light irradiated to each position instead of the hologram recording medium 55 or in addition to the hologram recording medium 55, and diffuses the entire illuminated area LZ with coherent light. You may make it have a lens array as a light-diffusion element to illuminate.
  • a total reflection type or a refractive type Fresnel lens or a fly-eye lens provided with a diffusion function can be given.
  • the irradiating device 60 scans the light diffusing element formed of the lens array with the coherent light so as to irradiate the optical element 50 with the coherent light.
  • the irradiation device 60 and the optical element 50 are configured so that the coherent light incident on each position of the optical element 50 is changed in the traveling direction by the lens array that forms the light diffusing element and illuminates the illuminated area LZ.
  • speckle can be effectively inconspicuous.
  • the light diffusing element is configured such that the irradiation device 60 can scan the coherent light on the optical element 50 in a one-dimensional direction, and includes the hologram recording medium, the lens array, or the like of the optical element 50. 55 is configured to diffuse (spread and diverge) the coherent light irradiated to each position in a two-dimensional direction, whereby the illumination device 40 illuminates the two-dimensional illuminated region LZ.
  • the illumination device 40 illuminates the two-dimensional illuminated region LZ.
  • the irradiation device 60 is configured to be able to scan the coherent light on the optical element 50 in a two-dimensional direction
  • a light diffusing element 55 including a hologram recording medium 55 and a lens array of the optical element 50 is configured to diffuse (spread and diverge) the coherent light irradiated to each position in a two-dimensional direction.
  • the illuminating device 40 may illuminate the two-dimensional illuminated area LZ (the aspect already described with reference to FIG. 8).
  • the irradiation device 60 is configured to be able to scan the coherent light in the one-dimensional direction on the optical element 50, and is configured from a hologram recording medium, a lens array, or the like of the optical element 50.
  • the light diffusing element 55 is configured to diffuse (spread and diverge) the coherent light irradiated to each position in a one-dimensional direction, so that the lighting device 40 can be illuminated one-dimensionally.
  • the area LZ may be illuminated.
  • the scanning direction of the coherent light by the irradiation device 60 and the diffusion direction (expanding direction) of the light diffusing element 55 composed of a hologram recording medium or a lens array of the optical element may be parallel to each other. Good.
  • the irradiation device 60 is configured to be able to scan the coherent light on the optical element 50 in a one-dimensional direction or a two-dimensional direction, and is configured from the hologram recording medium 55 of the optical element 50, a lens array, or the like.
  • the diffusing element 55 may be configured to diffuse (spread and diverge) the coherent light irradiated to each position in a one-dimensional direction.
  • the optical element 50 has a plurality of light diffusing elements 55, and the illumination device 40 is illuminated by sequentially illuminating the illuminated region LZ corresponding to each light diffusing element 55. A dimensional area may be illuminated.
  • each illuminated area LZ may be sequentially illuminated at a speed as if it were illuminated simultaneously by the human eye, or it can be recognized that the illuminated area LZ is also illuminated sequentially by the human eye. It may be illuminated sequentially at such a slow speed.
  • the irradiation apparatus 60 has an example having only a single light source 61a that generates coherent light.
  • the coherent light generated from the single light source 61a is typically light in a narrow wavelength band and is monochromatic light, as represented by laser light.
  • coherent light generated from a substantially usable light source that is, a light source which can be obtained at a low cost and has a sufficient output is limited to light of a specific wavelength (range). That is, light of various colors cannot be displayed with light from a single light source.
  • the form shown in FIG. 10 is an application of the basic form described above in consideration of such points.
  • the irradiation device 60 irradiates the optical element 50 with the synthesized light SL formed by synthesizing a plurality of coherent lights in different wavelength ranges.
  • the irradiation device 60 includes the first coherent light La in the first wavelength range, the second coherent light Lb in the second wavelength range different from the first wavelength range, the first wavelength range, The synthetic light SL formed by synthesizing the third coherent light Lc in the third wavelength range different from both of the second wavelength ranges is irradiated.
  • the first wavelength region corresponds to the first primary color component (for example, red component)
  • the second wavelength region corresponds to the second primary color component (for example, green component)
  • the third wavelength An example will be described in which the irradiation device 60 irradiates white light by an additive color mixture of the first to third primary color components in a region corresponding to a third primary color component (for example, a blue component).
  • the irradiation device 60 includes the scanning device 65 described above and a light source mechanism 61 that generates the combined light SL.
  • the light source mechanism 61 includes a plurality of light sources 61a, 61b, and 61c that respectively oscillate coherent light in a wavelength region corresponding to the wavelength region of each coherent light, and a combining device that combines the coherent light from the plurality of light sources 61a, 61b, and 61c. 62.
  • the light source mechanism 61 includes, as a plurality of light sources, a first light source 61a that oscillates the first coherent light La in the first wavelength region, a second light source 61b that oscillates the second coherent light Lb in the second wavelength region, And a third light source 61c that oscillates the third coherent light Lc in the three wavelength regions.
  • the synthesizing device 62 various members, components, apparatuses, and the like that synthesize two lights can be used. In the illustrated example, a half mirror having an advantage of being inexpensive and small compared with a cross dichroic prism or the like is used as the combining device 62.
  • the optical element 50 includes a hologram recording medium 55 made of a reflective volume hologram that diffracts the combined light and illuminates the illuminated area LZ.
  • the reflective volume hologram has a strong wavelength selectivity.
  • the illustrated optical element 50 includes first to third hologram elements 55a, 55b, and 55c provided corresponding to coherent light in each wavelength region.
  • the first hologram element 55a is provided corresponding to the first coherent light La in the first wavelength range
  • the second hologram element 55b is provided corresponding to the second coherent light Lb in the second wavelength range
  • the third The hologram element 55c is provided corresponding to the third coherent light Lc in the third wavelength region.
  • Each of the first to third hologram elements 55a, 55b, and 55c can reproduce the image 5 of the scattering plate 6.
  • the first hologram element 55a diffracts the first coherent light La in the first wavelength region as the reproduction illumination light
  • the second hologram element 55b diffracts the second coherent light Lb in the second wavelength region as the reproduction illumination light.
  • the third hologram element 55c diffracts the third coherent light Lc in the third wavelength region as the reproduction illumination light, whereby the images 5 of the same scattering plate 6 can be reproduced. .
  • the hologram elements 55a, 55b, and 55c for coherent light in each wavelength region are used as exposure light (reference light Lr and object light Lo) in the method already described with reference to FIGS. 3 and 4, for example. , By using coherent light in the corresponding wavelength range.
  • the first to third hologram elements 55a, 55b, 55c are stacked on each other.
  • the synthesized light SL scans on the hologram recording medium 55.
  • at least the first coherent light La of the combined light SL scans on the first hologram element 55a
  • at least the second coherent light Lb of the combined light SL scans on the second hologram element 55b to combine the light.
  • At least the third coherent light Lc of the light SL scans on the third hologram element 55c.
  • the first coherent light La of the combined light SL incident on each position of the hologram recording medium 55 from the irradiation device 60 reproduces the image 5 so as to overlap the illuminated region LZ, and from the irradiation device 60 to the hologram recording medium 55.
  • the second coherent light Lb of the combined light SL incident on each of the positions of the combined light reproduces the image 5 superimposed on the illuminated region LZ, and is incident on each position of the hologram recording medium 55 from the irradiation device 60
  • the optical element 50 and the irradiation device 60 are positioned so that the third coherent light Lc of the light SL is superimposed on the illuminated area LZ to reproduce the image 5.
  • the illumination device 60 illuminates the illuminated area LZ with white light.
  • the spatial light modulator 30 includes, for example, a color filter, and a modulated image can be formed for each of the coherent lights La, Lb, and Lc in each wavelength region. In this case, it is possible to display a video in a plurality of colors, and further to display a video in full color. Even if the spatial light modulation area does not include a color filter, the irradiation device 60 time-divides the coherent light La, Lb, and Lc in each wavelength area, that is, the coherent light La, Lb, and Lc in fine time units.
  • Irradiation may be performed sequentially, and the spatial light modulator 30 may be operated in a time division manner so as to form a modulated image corresponding to the coherent light in the irradiated wavelength region.
  • the image can be displayed in a plurality of colors when viewed by the human eye, and further, the image can be displayed in full color. Can be displayed.
  • the illuminated areas LZ of the respective coherent lights La, Lb, Lc diffracted by the hologram elements 55a, 55b, 55c of the optical element 50 are provided.
  • the incident direction at each position of the lens changes continuously.
  • the incident direction of the image light composed of the first to third coherent lights La, Lb, and Lc projected from the projection device 20 on each position on the screen 15 also changes continuously.
  • uncorrelated speckle patterns are superimposed and averaged, and as a result, speckles observed by the observer's eyes can be made inconspicuous.
  • the first to third coherent lights La, Lb, and Lc simultaneously illuminate the illuminated area LZ and are projected onto the screen 15 at the same time.
  • the first to third coherent lights La, Lb, and Lc are generated by different light sources 61a, 61b, and 61c, and thus have no coherency. That is, the speckle pattern resulting from each of the coherent lights La, Lb, and Lc is uncorrelated, and the uncorrelated speckle pattern is superimposed on the screen 15 and averaged. For this reason, in the application form shown in FIG. 10, the speckle pattern can be made less noticeable.
  • the hologram recording medium 55 of the optical element 50 has a plurality of hologram elements 55a, 55b, and 55c made of a reflective volume hologram in a stacked state.
  • the present invention is not limited to this.
  • each hologram element 55a, 55b, 55c may be configured as a transmission type volume hologram.
  • the transmission type volume hologram has a weak wavelength selectivity as compared with the reflection type volume hologram.
  • the wavelength selectivity of the transmission-type volume hologram can be adjusted by a measure such as increasing the film thickness of the hologram photosensitive material 58, for example. Then, by adjusting the wavelength selectivity of the transmission type volume hologram, each transmission type volume hologram diffracts only the coherent light in the target wavelength region with high efficiency, and the wavelength that is not the target. It can be avoided that the path of the coherent light in the region is greatly bent.
  • first to third hologram elements 55a, 55b, and 55c provided corresponding to the first to third coherent lights La, Lb, and Lc forming the combined light SL are stacked.
  • an example of forming one hologram recording medium 55 has been shown.
  • the first to third hologram elements 55a, 55b, and 55c are arranged on one plane.
  • one hologram recording medium 55 may be formed. That is, the hologram recording medium 55 is planarly divided into a plurality of regions provided corresponding to the respective coherent light in each wavelength region, and the coherent light in each wavelength region is diffracted in the corresponding region to reproduce an image. You may do it.
  • the spatial light modulator 30 may include a color filter and may operate so as to always form a modulated image for each of the coherent lights La, Lb, and Lc in each wavelength range.
  • the spatial light modulator 30 may be operated. May be operated in a time-sharing manner so as to form a modulated image corresponding to coherent light in the wavelength region irradiated on the light.
  • the frequency of scanning devices 65 such as MEMS mirrors and polygon mirrors that are actually commercially available is usually several hundred Hz or higher, and scanning devices 65 that reach several tens of thousands of Hz are not uncommon.
  • the human eye cannot recognize the color transition of the light that illuminates the illuminated region LZ (or the spatial light modulator 30). It is recognized that the illuminated area LZ (or the spatial light modulator 30) is illuminated by the combined light and an image is displayed by the combined light.
  • the first to third hologram elements 55a, 55b, and 55c are provided corresponding to the first to third coherent lights La, Lb, and Lc that form the combined light SL, respectively.
  • the object light Lo and the reference light Lr made of coherent light in each wavelength range are respectively simultaneously or separately.
  • the single hologram photosensitive material 58 may be exposed to diffract light in a plurality of wavelength ranges by the single hologram recording medium 55.
  • coherent light having different wavelength ranges is generated from different light sources and has no coherence with each other. Therefore, even if the hologram photosensitive material 58 is simultaneously exposed to coherent light in different wavelength regions, interference fringes between coherent light in different wavelength regions are not generated. That is, unnecessary interference fringes are not recorded on the hologram photosensitive material 58, and the hologram recording medium 55 made of the hologram photosensitive material 58 diffracts a plurality of coherent lights in different wavelength ranges with high efficiency. can do.
  • the striped pattern (refractive index modulation pattern or concave / convex pattern) to be formed on the hologram recording medium 55 can be obtained without using the actual object light Lo and reference light Lr,
  • a hologram so-called computer-generated hologram
  • a hologram recording medium 55 as a computer-generated hologram is planarly divided into a plurality of regions provided corresponding to the coherent light in each wavelength region, and the coherent light in each wavelength region is diffracted in the corresponding region and imaged. May be played back.
  • the optical element 50 changes the traveling direction of the coherent light irradiated to each position and diffuses instead of the hologram recording medium 55 or in addition to the hologram recording medium 55. Then, a lens array as the light diffusing element 55 that illuminates the coherent light over the entire illuminated area LZ may be provided.
  • the optical element 50 has a lens array
  • the combined light SL formed by combining a plurality of coherent lights in different wavelength ranges is not subjected to another optical action for each coherent light by the optical element 50.
  • the traveling direction can be changed by the lens array without being separated for each coherent light. That is, the combined light SL incident on each position of the lens array of the optical element 50 from the irradiation device 60 is changed in the traveling direction by the lens array to illuminate the illuminated area LZ.
  • the irradiation device 60 emits the combined light SL formed by combining the first to third coherent lights La, Lb, and Lc in three different wavelength ranges, and the first in each wavelength range.
  • the first to third coherent lights La, Lb, and Lc are primary color components for displaying white.
  • the first to third coherent lights La, Lb, and Lc in each wavelength region do not need to be primary color components for displaying white.
  • the combined light SL does not need to be synthesized from coherent light in three different wavelength ranges, and may be synthesized from, for example, coherent light in two different wavelength ranges.
  • the irradiation device 60 may irradiate the optical element 50 with the combined light SL along the optical path of one light beam forming a virtual parallel light beam. That is, the irradiation device 60 may irradiate each position of the hologram recording medium 55 of the optical element 50 with the combined light SL traveling in a certain direction.
  • the scanning device 65 is a lens as a collimator that deflects the traveling method of the light reflected by the reflection device 66 in a certain direction. 67 may be included.
  • the lens 67 is used as the lens 67 from the viewpoint of preventing problems such as chromatic dispersion. It is preferable to use a chromatic lens.

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  • Projection Apparatus (AREA)
  • Mechanical Optical Scanning Systems (AREA)
PCT/JP2011/070529 2010-09-08 2011-09-08 照明装置、投射装置および投射型映像表示装置 WO2012033179A1 (ja)

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EP11823653.8A EP2615496B1 (de) 2010-09-08 2011-09-08 Beleuchtungsvorrichtung, projektionsvorrichtung und projektionsvideoanzeigevorrichtung
EP18214351.1A EP3486696B1 (de) 2010-09-08 2011-09-08 Beleuchtungsvorrichtung, projektionsvorrichtung und anzeigevorrichtung vom projektionstyp
US13/821,754 US9039188B2 (en) 2010-09-08 2011-09-08 Illumination device, projection device, and projection-type image display device
JP2012533031A JP5737633B2 (ja) 2010-09-08 2011-09-08 照明装置、投射装置および投射型映像表示装置

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JP2014215451A (ja) * 2013-04-25 2014-11-17 大日本印刷株式会社 照明装置、投射装置および投射型映像表示装置
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US9039188B2 (en) 2015-05-26
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